LintCode 1066 · Verify Preorder Serialization of a Binary Tree (二叉树判断好题)
1066·VerifyPreorderSerializationofaBinaryTreeAlgorithmsMediumDescriptionOnewaytoserializeabinarytreeistousepre-ordertraversal.Whenweencounteranon-nullnode,werecordthenode’svalue.Ifitisanullnode,wereco